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The energy stored by a structure and location of matter in space is called potential energy. For instance, raising a kettlebell changes its spatial location and increases its potential energy. Similarly, a stretched rubber band contains potential energy which, under certain conditions, can be converted into other forms of energy, such as kinetic energy.
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A generalized force-modified potential energy surface for mechanochemical simulations.

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Area of Science:

  • Computational chemistry
  • Theoretical chemistry
  • Molecular modeling

Background:

  • Potential energy surfaces (PES) are fundamental to understanding chemical reactions.
  • External loads can influence molecular behavior and reaction pathways.
  • Born-Oppenheimer approximation is a cornerstone of quantum chemistry.

Purpose of the Study:

  • To investigate how spatially varying external loads modify Born-Oppenheimer potential energy surfaces (PES).
  • To quantify the effects of external loads on molecular stationary points and reaction dynamics.
  • To analyze the impact on harmonic transition rates and spectra.

Main Methods:

  • Utilized electronic structure calculations at the HF/6-31G(∗∗) level.
  • Calculated static quantities of interest on the PES.
  • Examined transition states and Hessian matrices of stationary points for ethane and hexahydro-1,3,5-trinitro-s-triazine (RDX).

Main Results:

  • Spatially varying external loads shift stationary points and alter the curvature of the PES.
  • Harmonic transition rates are affected by changes in both energy barriers and prefactors.
  • Harmonic spectra exhibit a blueshift with increasing compressive load.
  • Some stationary points on the RDX-PES disappeared under load, indicating merging of minima and saddle points.

Conclusions:

  • External loads significantly modify molecular PES, influencing reaction dynamics.
  • The study provides insights into load-dependent chemical reactivity.
  • Computational methods can effectively predict the effects of external perturbations on molecular systems.